Phalcon 「Action was not found on handler Controller」の一般的な対応方法

$di->set('dispatcher', function () {

    $em = new \Phalcon\Events\Manager();

    $em->attach("dispatch", function ($event, $dispatcher, $exception) {
        // controller or action doesn't exist
        if ($event->getType() == 'beforeException') {
            switch ($exception->getCode()) {
                case \Phalcon\Dispatcher::EXCEPTION_HANDLER_NOT_FOUND:
                case \Phalcon\Dispatcher::EXCEPTION_ACTION_NOT_FOUND:
                    $dispatcher->forward(array(
                        'controller' => 'index',
                        'action' => 'route404'
                    ));
                    return false;
            }
        }
    });

    $dispatcher = new \Phalcon\Mvc\Dispatcher();
    // Set default namespace
    $dispatcher->setDefaultNamespace("Your\Controllers");

    $dispatcher->setEventsManager($em);

    return $dispatcher;
});

IndexController.php

namespace Your\Controllers;

class IndexController {

    public function route404Action()
    {
    }

}